Transmission gearing



Aug. 16, 1932. R. s. PLEXICO 1,872,338

TRANSMISSION GEARING Filed NOV. 18, 1926 INVEN TOR.

Robert iP/exz'co,

A TTORNEYS Patented Aug; 16, 1 932 TRANSiiIssmgi m I particularly thattype of transmissionwhere-v in epicycloidal gears speed changes. r i e"For the purpose of disclosingmy invention I' have illustrated anembodiment there of in the accompanying drawing which-e- Fig. 1 is alongitudinal'section of an auto:- mobile transmission embodying myinvention; Hi 1 p H -Fig.'2 is of Fig. 1;

Fig. 3 is a sectional view of Fig. 1,*and' w a I Fig. 4 is a'sectionalview on'the line 1'4= of-Fig. 1. In the embodiment illustrated I providea transmission casing 1 which may be of any suitable typehaving a top 2providedwith a are used for one of the a sectional view on: the line onthe line 3 'j3 cone support 3 in which is mounted, for unive'rsalmovement,' a shifting lever 43 adapted I tooperate sliding rods 5,-5providedwith the usual shifting forks 6 and '7. e

The driving shaft 8; which is adaptedto be connected with the engine orpower unit through the usual clutch connection, extends into the casingand has lon'eend journaled in a suitable ball bearings "9 "mounted" inthe frontwall'ofth'e casing. This driving shaft 8 is"pro,vided at itsinner endand'within the casing with a driving gearllO'. The driven shaft11' also extends into the: casing, be-

ing supported in a ball bearing 12 in the end wall oflthe casing,' andat-Iits forward end by a ball 'be'aring'1'3 mounted in a bridge member1 1. extending from the inner wallof theming. That portion" of {theshaft extending into the casing is squaredas at 15' and has slid'ably'mounted thereon 'apair 'of s'peed changing "gears 16' and 17 which, dueto the square'on the shaft are rotatable 'with the shaft; These "speed"changing gears 16 and '17 are adapted to slid iIltd- I11GSl1iI1g engagement respectively with speed Changing gears 18' and '19 rotatablewith a sleeve 20 surrounding a shaft 21; The oppositeend ofthisisleeveis provided witha gear 22 meshing-with the gear 10. The gears 16, 17 and18, 19 constitute the first and second 45 speed changing gears of thetransmission. There is' also. provided suitable: reversing gears 23, thestructure .of which need not; be described in detail as these are ofthe-usual reversing gear construction of the commercial to type ofautomobile transmission; w

-A hub 24:isv arranged between the ends of the two shafts 8 and 11being; rotatably supported inia pair of spaced-roller bearings 25 and26, supported by the walls of the cas- I ing and this hub is adapted torotate on an axis eccentric torthe -axis .of rotation of the shafts 8and -11'. The forward vend'of this .hub is provided with an internalgear 27 meshing withagear 28 rotatably mounted on 70 a'nextension'29 ofthe shaft 8, whichzextension projects beyond the gear'lO. It will benoted that the bearing support, formed by the extension 29 isconsiderably less in with; than the width of the gear so that the inner75 periphery of the gear may be provided with teeth 30,jthe:-purpose ofwhich. will appear more fully hereinafter. The opposite end of thehub'is provided with an external gear 31 adapted to mesh with: aninternal Lge ar 32 on the end of the shaft 11 and formedintegrallytherewith. The arrangement is such that the bearings 26 and'13 are' arranged on approximately 'ibelow the bearing-'13 iswidened andprovided withinternal -teeth 35 and the shaft 33 isprovided-'withexternal teeth 36 adapted; whenthe shaft is movedlaterally in one direction-to mesh with the teeth {00 Longitudinalmovement is imparted tothe i shaft 33 by the sliding fork Sand to thisend I provide a ring 42 surrounding. the hub 24 and provided with anannular groove'43 into which the fork 6 takes; Thisring is operablyconnected to a series of radially extending pins 44. These pins radiallyprojeot through longitudinally extending slots 45; in the hub 24,- froma. ring 46. operating in a groove 47 in the shaft.- 33. andconcentrically mounted with respect to the hub 24;

In operation, with the parts in the position illmrated Fig; 1, thetransmission is in neutral and no movement is transmitted from the shaft8- to the shaft 11. By mowing the gear- YZ" intormesh with the gear l9power will be transmitted from-the shaft: 8; to; the shaft-.11 throughthe gears 10; and 22 and the gearslQv and 17? at low speed. Ifthegear'16 ismoved intomeshwith the gear 18 thezpower will be-tronsmittedtothe shaft 11 at a higher orsecondspeed. Y When the shaft 33:is. movedforwardto cause theclutch teeth 41 to move into clutch ing engagementwith the teeth 300111118 gear 28 the gear 28;. will be; drivinglyconnected withthe shaft 8, due-.tothe fact that the teeth 49mrein'engagementwith. the teeth 39*. The gear-28 M111 thus be rotatedand power will be transmitted to the shaftll from: the gear 28 through.the internal gear 1 27,. the hub. 24 andzby the-external gear andinternal gear 321th the'shaft' 1'1, and the shaft 111 will be driven atits; third. speed. If-thea 33.;be shifted in. the opposite directionuntil: the clutchteeth- 36zengagevthe clutch teeth. 35 the: teeth.41'willjbe moved out of. engagement with the-teeth iso: that the gear28:will.be disconnected fIYOIIL the shaft'8 and due-to the factzthat;teethi39 arestill in engagement with teethAO and teetha36 are inengagement with teeth :the,t;wo shaftsS and'fllrwill be di.- motly,connectedthrough the shaft'g33 thereby driving shaft 11 atthe:samerspeedasathat of shaft-8;. a

IiclBim-L Y o 7 -11; In combinationaa: driving and a; driven 7 shaftc0..-axiallymounted;an external gear on gear-sand; havingr-sets ofexternal andiinternal'teethinmesh=withtheiinternaliandiexe er alzgearsespeotivelyahe; gear on thedriv- 'ing shaft being normally drivinglydiscon nected therefrom, means for drivingly connecting said gear tosaid shaft, a pair of spaced apart stationary bearings for said hollowgear member arranged adjacent the gears thereon and a stationary bearingfor said driven shaft arranged adjacent the gear thereon and ontheoppositeside of said gear to one of. said first mentioned bearings.

2, In combination a driving and a drivenshaft, co-axially mounted, andhaving their ends spaced apart, an external gear on one of said shafts,an internal gear on the other shaft',"ahollow eccentrically mountedmember disposed between the ends of said shafts and having sets ofexternal and internal teeth so in mesh. withthe internal and externalgears respectively, the gear onithe. drivingshaft being drivingly idle,alongitudinally shift,- able member disposed between the ends of said.eo-axial shaftsanddrivingly connected with the driving shaft, a. clutchmember on said idle gear and a clutch member on said longitudinallyshiftable: member arranged to engageethe clutchmember, of said .ax todrivingly connect the gear with sai shaft, Q0 clutch members, on thedriven shaft and clutch members on saidishiftaiblemember arranged to.moved by the. shiftingof said member: into engagementwith the clutchmembers; on the; driven shaft to driving}; connect the driven shaft withthe driving shaft through. said longitudinally shiftable member.

31, In. combination; a driving, and. driven shaft co-axially mounted, anexternal gear on mo onezofsaidshaftsmnd an internal gear onthe other ofsaid shafts, the gear on the driving shaft beingf drimingly id-lewiithrespectlthereto-,.a hollow eccentnieall-y mounted gear nembeninterposed:between the, ends, of said shafts and. havingfsets of external. and in?ternal teeth inimeshwith the external and in,

teraial; gea13s,, a longitudinally shiftable. member mountedwithinsaidhollpw member. and interposed: between. the ends of saidshafts no and drivingly connected with the driving shaft,said;idlege'anand shiftable member having inter-locking clutch membersmoved into interlocking position-by the longitudinal shifting of thememher to; connect said idle 5 gear. .with. thedriving shaft and said,driven shaft and saidlongitndina'lly shiftable'mem her having;interloeking clutchmembers moved. into interlocking, engagement. by thelongitudinalv movement; of said; member to directly conneet-saiddrivenldiaft to the adriv iug shaftt' V f 41-. In combination, 7 a driving;shaft" and: a driven shaft. cozaxially; mounted*,.an external gear onone of saiclsh'a fts. and. an internal gear on the other shaft,the-gear. on saiddriving shaftubeing; drivingly. idle relativelythereto, a. longitudinally shiftable: member interposed betvreenthe endsof'said shaftaand drivingly connectedrwi th; the.- driving; shaft,

interlocking clutch members on the idle gear and shiftable member movedinto interlocking engagement. by the longitudinal shifting of saidmember to connect the idle gear wit said driving shaft, interlockingclutch members on said driven shaft and shiftable member moved intointerlocking engagement by the shifting of said shiftable member toconnect the driven shaft to the driving shaft and 10 a holloweccentrically mounted gear member in surrounding relation to saidshiftable member and having sets of external and internal teeth in meshwith the internal and ex- V ternal gears on said shafts.

1 5. In combination, a driving and a driven shaft co-axially mounted andhaving their ends recessed, internal teeth formed in the recessed end ofthe driving shaft, internal teeth formed in the end of the driven shaft,

20 a bearing for each of said shafts adjacent said teeth, alongitudinally shiftable member interposed between the ends of saidshafts having teeth meshing with the internal teeth of the driving shaftand teeth adapted to 25. move into engagement with the teeth of thedriven shaft by the longitudinal movement of said member, and externalgear on one of said shafts and an internal gear on the other of saidshafts, the gear on said driven shaft 3 being adjacent the bearingtherefor, and a hollow eccentrically mounted member having a externaland internal teeth respectivel meshing with the internal and externalteeth of the shafts and a pair of spaced apart bearings for said memberarranged ad]acent the respective sets of teeth.

6. In combination, a driving shaft and a driven shaft co-axiallymounted, an external gear on one of said shafts and an internal gear onthe other of said shafts, the gear mounted on the driving shaft beingdrivingly idle relatively thereto, a longitudinally slidable clutchmember interposed betweenrthe ends of said shafts and arranged when inone 4 position to drivingly connect the driving shaft with the drivenshaft and a hollow eccentrically mounted gear member surrounding saidclutch member and having sets of external and internal teeth in meshwith the 50 internal and external gears respectively. p

In Witness whereof, I ROBERT S. PLEXIGO have hereunto set my hand atMuncie, In diana, this 13th day of November, A. D. one thousand ninehundred and twenty-six.

88 ROBERT S. PLEXICO.

